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Related Experiment Videos

Towards zero-threshold optical gain using charged semiconductor quantum dots.

Kaifeng Wu1, Young-Shin Park1,2, Jaehoon Lim1

  • 1Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.

Nature Nanotechnology
|October 17, 2017
PubMed
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Negatively charged quantum dots significantly reduce lasing thresholds for solution-processable lasers. This breakthrough in colloidal semiconductor quantum dots (QDs) enables lower energy requirements for optical gain media.

Area of Science:

  • Materials Science
  • Optics
  • Nanotechnology

Background:

  • Colloidal semiconductor quantum dots (QDs) are promising for solution-processable lasers.
  • Non-unity degeneracy of band-edge states complicates QD optical gain media.
  • High lasing thresholds and short gain lifetimes arise from multiexcitons and Auger recombination.

Purpose of the Study:

  • To investigate the use of negatively charged quantum dots to improve optical gain media.
  • To reduce lasing thresholds and enhance optical gain lifetimes in QD-based lasers.
  • To explore the feasibility of 'zero-threshold' gain in quantum dot systems.

Main Methods:

  • Engineered quantum dots with impeded Auger decay were utilized.
  • Photodoping was applied to create negatively charged quantum dots.

Related Experiment Videos

  • Optical gain thresholds and amplified spontaneous emission thresholds were measured.

    • Main Results:

    • A considerable reduction in the optical gain threshold was achieved.
    • Pre-existing carriers in negatively charged QDs suppressed ground-state absorption.
    • A twofold reduction in amplified spontaneous emission threshold was observed, reaching the sub-single-exciton level.

    Conclusions:

    • Negatively charged quantum dots offer a viable solution to overcome limitations in QD lasers.
    • Suppression of ground-state absorption by pre-existing carriers lowers lasing thresholds.
    • Feasibility of 'zero-threshold' gain is demonstrated by blocking band-edge states with electrons.